Write the uses of multiple reflection of sound

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Solution

During multiple reflections, the sound waves get added up. This increases the amplitude of the sound.
The concept of multiple reflection is used in the working of devices such as:
1-Stethoscope
2-Megaphone
3-Bulb horn
4- Sound board

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Which of the following uses multiple reflections of sound?

A device based on multiple reflection used for sending amplified sound in a particular direction is:

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